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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba38e3c48ffaa3ef1990f441e1c9075b70f642876b11e0a68277657694d6d18f' 
  AND token = 'maqCGo0/V+sxEkR35LdSRewGiGS5LAfQ/LaK8FRlodw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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