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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a008bbcb36b8cadb1adae2b3e52d43ab39165e5bc06e3cd7da5d4d24f83a4f6b' 
  AND token = 'idcaREV1HXfqjBoRJyOhxjnZJtknJ4ZsQqtwNCVt4EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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