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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bc4fa6efb94ed315b6654e2033f36013c40df91e4ac84e22d8ab71a6dc7ad4' 
  AND token = 'vxjQyVCG1i988d/c/u3mFXZ5XvDK8JLf6bVCJ4w/r9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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