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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d6a1047a77c490b7bbda2ac158c1ea7bbd9fd96ddcb8c417d49119f3b6fcdb' 
  AND token = 'Md+CSzkIHUGF+ML/akoaqMlO9JYXwfFVZnMNms7tQKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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