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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105ab0c9092318a0424f9d83bf09b40a103b668bcba7df12aaa0312d51d167a6' 
  AND token = 'xYKs3tgtyoVnKSPMNQgkavVrDapuG9kjVd/lT+liecQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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