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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ac7294c091cf54406aaeb6ff4d79a35eb490c97acc48c69228792bf14677fa' 
  AND token = 'uufq67hlcVi4+1JWumAPBqndPVOFcFaOnqCd2+EBzkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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