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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabc1d8c590363bae8da0e342b403c17c0a7337877cbd384c1d36af4e5238af2' 
  AND token = '/tUySUJTyGvTtMbuXbTXlq+diouFvil1mTB6o0ZL7Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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