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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd508701ce0d5d411a7e07603db0eb9176787ef3aa96026c1eb89d291fd6378e0' 
  AND token = 'zKp2OaJu/XLkckzgxyeUGTnt891eDoGvNT982fXaCHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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