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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01c69bc153469fe68d4a0c28c6096a44ab0f62e59a673ce43abb0cf92fbe89a' 
  AND token = 'A5Q3ShkyOYx9EaQZish4aewfM3zsPkc4WwtyuYY4zSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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