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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9f667f1da373de6c3b3fe36df83803e9fc9da89765f0786d1a25b0a6de7e01' 
  AND token = 'SYmZ80laXdRwHvRYLnkrs2uR1fxQd+Vbb8knxITPrj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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