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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a47db577f571ff3e20b22f3ce3c1531af9c8dee300209e7118c2e47f1d7c18' 
  AND token = '1lLLe3amGgHYuBzPUH5/rdVP2DnPQVPS++sz4dtE0Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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