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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7a412382d93cd9948eee639a8f618bf9e3a1924b2edfd256d9d2852798efe4' 
  AND token = 'V0SxzFk9Pm/xjh6Q2iec7tRmsn5fUrhGeqWk5UmFYiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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