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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92d3e76c12e533fe6126aff520f05fd0b78c5d4c0af2f74496da01e743b9b42' 
  AND token = 'RwhQ11RDA3FywVEqRaaRoWqZXcB+HdOQC7NuHwiqbig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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