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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bfee762637e926a4c7f866f0d8228c23d8d5627756512c6ba3966e958cb095' 
  AND token = 'JrOnRgm2pA3tnj1b25qxO7+vFmRtuS8X3dZRqndjB4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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