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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032ebdab18aa56fe99a79caf24d34ddf49de40dd24872032aa67cbc648e40143' 
  AND token = 'u4GkKxM6QdCzU1B3eQVncYpuvy5J7IuNkxEE/eBRQJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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