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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9244df84ce9b99ff517467223ad98c2a4f273d9c9019bdc4ab36bc8c8a7641' 
  AND token = '8An3geeJKPqQ0EDuv1N+xdgnPbQc1MzGtSfP0D46/So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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