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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3e8da17bf7dd75e0f96f1a4dca116cbd79713dc3f4ee06614c1117c195408a' 
  AND token = 'yAAZ191jh5oF2vavmpH+EdYjDLmByu/RYEUNRAih1R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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