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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4640636de06f9fb6558eee1cf4c2d45975af6d646d284f2482e67440aec0c2' 
  AND token = 'UabqAF1/xmtm6gz5Gsz1F/JEgQPLTL9MuqCkHNMlNag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}