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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc1e510abfa0ec95b728dc840a065c2e667f60ce132028cb656f4cee0774f52' 
  AND token = '5dagxJVzI+6TDWi/Wg/IcbMoG0mvHUo1nF2/I++mVDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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