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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0230a17780caa9437e8a784d50aff32298025883198d623ce2df6fb8be970623' 
  AND token = 'NtQvM/eCLZhEx6Rtzf2wv2D0HGQGU8cF+kfSaocTk1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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