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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328bb433b8a37ec090f9b59659b742658e80f6f1f1affba75e0fdb0dc976a9cc' 
  AND token = 'Dpf9I2U1igGvnIqx3ZsSxpS3MA83AAffL4y3YwbwXIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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