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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a64b3089e9cfc5f1670f6ccbf72f4cf948fd9b869ed71cdea804d893c21a5eb' 
  AND token = '1rA1gPQNCc8o5c+IK7Z4JtzaPKUExj+FJ6amgC6aQxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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