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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a32da89f8f5856b71c7c5d63a1a4cba5e2416e04e0f28e6d1874e98cfc2a145' 
  AND token = 'LaMO/NVokahWzydiLV2p6x/1rj9zZVHgCNQr2Iaa4ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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