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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae00bccc973490bdf874e3359268d38aba38c80f2ac3d84550fab6e52b16f89' 
  AND token = 'tmaP9BUxNHzwZrv3Si41LQC3ZCUaFRzfVeuX+gcrVms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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