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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc55b11c885eaecc853b82dc9bc998607fbf5b7880d7172029004d08a8f5d68' 
  AND token = 'TE3YPlMGRukRhr3OF5bkp+A7moWod4dBeQT2+Vs3Vb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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