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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732ac75b0aa5f38dda6e5d174576e872365234e28b07f4e11a4259087a225966' 
  AND token = 'b0dUUW6ICYiLo9npsX4+1G6/6D2OlB7biN/lLcEEA2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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