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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de15bd55085c6de0241996352a9b4f9c1c7ccae90bb644d5189e4a234a13ef08' 
  AND token = 'IPxolfr1Xz5pi3O7Nt+1T7shzcYgsTD3BA2/edkpfVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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