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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cacab92e976272dcdf0bab7360608782fc46bd369d6b603bc07ae8b6fac0fcf' 
  AND token = '3ETyb+BkZoBox6jRcFwp/pkqJjPw/zp6F+uFc04gsm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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