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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c702925aad663986d32f69aecb4029cf697641c84f91b35731e7af95c6f53302' 
  AND token = 'p7dnjOAKAyUApRmavHbGJt/EOo1SFa32u9oKfPvV/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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