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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1ad1345cd82f5e8904ef528465094c4f8c2ae074229b0c236a0cd25af6d98c' 
  AND token = 'SX/XrXCaOb8eAPnb+8KLsbMnb88PVejTSVKZ22xc5Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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