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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15802914e5205932c65ba781945da8c8fb99926e2fa364733acb4b316312d4b' 
  AND token = '5QslZLJ0F9xbGW0+O7rtPXGtgJ/fQYr1O0WeLyiFtcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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