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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233dfd6faaddffd4ad8ab4e8b61f5d577de4e7feec0125b6512e7cd310414677' 
  AND token = 'o2ubU89rHVCasD/YdpUWjiR7IBxMHJO1IEyVzhfL/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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