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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2e10e4af1f858b240286bb91cc6840fff878a287390488750fb6abb6220892' 
  AND token = '/pC6fYbWdlBG/xsjhKByra5rLXhcOzKWwgXgTCpta1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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