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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d95e1a4ffbcc3d5ce94ed69c7e6e00e95971d1d452849e74c258034e52d56d0' 
  AND token = 'jbxzJE9EPp0urLkxvwRKlGMb+943zzNZpbm+xMjsBSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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