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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce7a929c346e0f98705ac75228ed0f15c9fdd3160fb208a592862872eab2869' 
  AND token = '1hrRvQLX9TNBYYOC+36oYD+2ETsBkhL7bL+0WO3rR0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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