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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37aac79dfd97a7c37d950fde4703fb0248354d412b74decf62c53731e4dd6a39' 
  AND token = '06c2Ai+SC5LLjHF/HMUSkyxIIfPH2GX5IoPLjhueN3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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