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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a793188d4e5134d1e2306fb6b59a60df21b6e3683d677203956230aff4dce100' 
  AND token = '+srldHjtMV+rPSnUOmK4XP/Vki0loEofSx3x9p+DVB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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