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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de8d84de731667f3f4b78d98f70dad3a01cd2bbd3c3be1b8a4bcd911355bc8b' 
  AND token = 'gVvThJL2iu9O4kU07GmEOOS/roSrnF4XHEDXw872k+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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