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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a1b1f9fa9d3cd85571622cf9e90d7ac2d540bc382ff310a0048910af3e7446' 
  AND token = 'HfwDBfXiNETnfsDNd5niE/EC2EKYuJE1tfr2TLhwLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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