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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab1f2a1579408a979271de28b6ba97f3d315df096a8d237c0b36765ebfdb2fb' 
  AND token = 'pCCB6Y+3VgHOMRlnBhsttmX3Yl6Efjn0rcwwfDNK7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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