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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c3794eb2a696201c4be2ec3182f7eeb38fb9aed75ddab75151ea02bc9b4b9e' 
  AND token = 'jZCbUxV14alt5Zhsyd76OSVVAa0DEdNgudM0GoAcDeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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