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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa6d12009e3917b8b46a17cad7b5e9af1b5e5d76828e73f90c057c71dae3794' 
  AND token = 'qJApPfWjh2LoDf1Ur1D5J3psXJsHQc1ZHQPYA7ZuEJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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