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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ab97f8747414935f9aca6722544ce2790223fc2fc7fb47201d26198db05011' 
  AND token = 'lsDNH4QJyNO0rRp+Kxer2x9M7vk92ACVuIug6T7F2ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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