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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7835794ed9de162b20deead396aed1f9816771655250573b685f750e55e55d35' 
  AND token = 'kaCByF7o89x6+u48u9XszzAl+T8pquNlq3+gBn0F+Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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