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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee72fcbecebee01c03b2dcea00ca145a809e6f4ca4ea7448ca759caec9cf79d' 
  AND token = '39kGEdD9R4Ey37EWr/xi9da8KRxbgoFXyewboBz+bv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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