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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca7a2a7acb8ef4bbb9429534931ec2964a5c0ced4df5ac4ffdeb4785aadc4de' 
  AND token = 'ZHut8Pmzcgi1QsYWhQz3PmIQN5rHOID/KThnwK62rzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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