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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1398bcc67fc0892aacb0f6361697a7b594832a672d8675f46d3426ec10fe0b' 
  AND token = 'F4Yyygg+sOqup3qJRheZZgboQA2dqT7cAeR6oyNF7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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