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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab74f474fa3304939791c4a10efe5d42e3735d9eb84b3b9730ad6b4c33b29f5' 
  AND token = '3hutfqt56Ai7hCLSgEbfHLQG1cS3ErcxrpNeT54entM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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