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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbe238bf77d3a2bb0ef3cb0f8dca445269001f9fb19eb7dedbf046bd8d9cd51' 
  AND token = 'oowGPBg4Y0f0APqY9f1GbR7n9POuIoHfm0QrYJpCPis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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