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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6371eaa5ca14a09682c3b62e33fed5ea140ce0291306c8627e0a04cfdd1697a8' 
  AND token = 'Cawccqpea2gTFBDA6HAY7aTcvYYsneDUzA3PFJ3gDqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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