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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24ae374b04cce3b91863728079722c0e9649e40d698a1bd433f30cd30a7c887' 
  AND token = 'N8JBNinvBZ1DeruTgH0bA+DF2WuWpNTc/icZNed3dNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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