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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06d5739d731eae1472a8879234803a4d6b0e8f96579a6a7ed04c95ed94411e2' 
  AND token = '6ndg80yxc9pwAQyyop25QvXWhd1VI46Q40XxTVMPMd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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