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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ca6e1252e1a2efbb42e48885e5d6e3d48b3b055514fa3ba9afe637b4a942d4' 
  AND token = 'XIgwouK+apaWpPAHMiHrXsgR3n23J3Gc2eQz+4wyUUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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