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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f7829a3c87ef1c878091767af480a613032d53bc22cae480445910e54226bb' 
  AND token = 'C899yMH0uh284q1iRCtUGiuNds7SNBiK6heuHiCmBmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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