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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c45832bbe31a6a01a18e60fedb7cf7d60ef47a1306a6aec01d3457b83ef01c' 
  AND token = 'Dd2dRInr822L6P4uycW2jf7KG3Xph7cU78jn2GW2I+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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