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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0593c7be7807ab3633bb91d3e5e7fff9bdd2d183d19745d0c6ad531d8c260592' 
  AND token = 'KAbyEPBICVag5T7yrGXjyLyfq6dr8nJXyd5/5e3bLHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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