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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02d5df42789d63d1fa777072a3bf2091fd2016f402a0d2d0979a5f3dbd62a08' 
  AND token = '/V7SMr7E/FGEsKM6dL5n3Y1mFUQrIq9rwjmdFCJDWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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